1989 vacuum line diagram 89 jeep cherokee laredo


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2004 Jeep Grand Cherokee Limited DIAGNOSIS AND TESTING – VACUUM RESERVOIR

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Filed Under (Jeep) by admin on 18-11-2010

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1. Disconnect vacuum hose at speed control servo and install a vacuum gauge into the disconnected hose. 2. Start engine and observe gauge at idle. Vacuum gauge should read at least ten inches of mercury. 3. If vacuum is less than ten inches of mercury, determine source of leak. Check vacuum line to engine for leaks. Also check actual engine intake manifold vacuum. If manifold vacuum does not meet this requirement, check for poor engine performance and repair as necessary. 4. If vacuum line to engine is not leaking, check for leak at vacuum reservoir. To locate and gain access to reservoir, refer to Vacuum Reservoir REMOVAL /INSTALLATION . Disconnect vacuum line at reservoir and connect a hand-operated vacuum pump to reservoir fitting. Apply vacuum. Reservoir vacuum should not bleed off. If vacuum is being lost, replace reservoir. 5. Verify operation of one-way check valve and check it for leaks. a. Locate one-way check valve. The valve is located in vacuum line between vacuum reservoir and engine vacuum source. Disconnect vacuum hoses (lines) at each end of valve. b. Connect a hand-operated vacuum pump to reservoir end of check valve. Apply vacuum. Vacuum should not bleed off. If vacuum is being lost, replace one-way check valve. c. Connect a hand-operated vacuum pump to vacuum source end of check valve. Apply vacuum. Vacuum should flow through valve. If vacuum is not flowing, replace one-way check valve. Seal the fitting at opposite end of valve with a finger and apply vacuum. If vacuum will not hold, diaphragm within check valve has ruptured. Replace valve.

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1991 Jeep Cherokee Laredo Anti-Theft System – Cherokee DESCRIPTION & OPERATION

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Filed Under (Jeep) by admin on 09-12-2010

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Passive anti-theft system is designed to prevent vehicle theft. The Security Alarm Module (SAM) is a logic controlled device that monitors vehicle doors, hood, liftgate and ignition action for unauthorized operation. The alarm activates by sounding the horn, flashing the headlamps, park and tail lamps and providing an engine kill feature. Passive arming occurs upon normal vehicle exit (open door, lock with power locks, close door). The Security lamp in the panel will flash for 15 seconds, indicating that arming is in progress. Note that this 15 second arming period will start after the Illuminated Entry has timed out (courtesy lamps off). If no monitored systems are activated during this period, the system will arm. If the hood switch is not seen by the system, the Security lamp will remain steadily lit during the arming process, although the system will still arm. Active arming occurs when the Remote Keyless Entry transmitter is used to lock the vehicle doors, whether the doors are open or closed. If one or more doors are open, the arming sequence is completed only after all doors and liftgate are closed. Passive disarming occurs upon normal vehicle entry (unlocking either door with the key). This disarming will also halt the alarm once it has been activated. Active disarming occurs when the Remote Keyless Entry transmitter is used to unlock the vehicle doors. This disarming will also halt the alarm once it has been activated.

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2005 Jeep Grand Cherokee Laredo Intermittent no crank condition

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Filed Under (Jeep) by admin on 13-12-2010

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Customer Concern: Tests/Procedures: Potential Causes: Intermittent no crank condition. Customer reports hearing a single click. Tried new starter. It happens intermittently. It is cranking normally right now. 1. Test the battery first. Replace as needed. Be sure to check all the cable connections. 2. Duplicate the problem and see if there is power getting to the starter on the Yellow/Grey wire in the crank position. 3. Check the voltage drop of the cables or simply use jumper cables to see if it will crank over, if it does the cable(s) are at fault. Battery Cables Connector

1999 Jeep Grand Cherokee Laredo DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM

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Filed Under (Jeep) by admin on 14-12-2010

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NOTE: NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see GRAND CHEROKEE wiring diagram in WIRING DIAGRAMS article. DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM is monitored during engine cranking. DTC may be stored in Powertrain Control Module (PCM) when PCM senses no Crankshaft Position (CKP) sensor signal during engine cranking, and at least 3 Camshaft Position (CMP) sensor signals have occurred. Possible causes are: defective tone wheel/flexplate, defective PCM, defective CKP sensor, defective CMP sensor, defective connectors or defective wiring. 1. Turn ignition on, with engine off. Using scan tool, read current CKP count and attempt to start engine. If current CKP count does not change while attempting to start engine, go to next step. If current CKP count changes while attempting to start engine, go to step 16). 2. Turn ignition off. Disconnect CKP sensor connector. See Fig. 26 or Fig. 27 . Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on CKP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, repair open 5-volt supply circuit. Perform TEST VER-5A.

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1998 Jeep Grand Cherokee TSi MEMORY POWER SEAT TRAVEL RANGE

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Filed Under (Jeep) by admin on 19-06-2010

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Model(s): 1996-99 Chrysler (NS) Town & Country 1996-99 Chrysler (GS) Voyager 1996-98 Jeep (ZJ) Grand Cherokee 1996-98 Jeep (ZG) Grand Cherokee (International Market) The Memory Seat/Mirror Module (MSMM) (on ZJ/ZG the module is for the seat only) detects and remembers where the end of seat travel (called “soft stop”) is in each direction. A soft stop is set in MSMM memory when the position sensing feedback voltage, controlled by a potentiometer on the motor end, fails to change. The feedback voltage potentiometers vary the position sensing feedback voltage based on seat position/movement (no movement, no change in position sensing feedback voltage). The seat motor automatically stops at the soft stop on any subsequent movement so the motor does not run into a stall condition (end of travel). The soft stop limits will be updated any time the MSMM senses a mechanical stall (such as when something is stuck under or behind the seat that causes the seat to stop moving). These soft stops can prevent the seat from being able to have memory positions set over the full range of travel. Also, positions that were previously programmed to locations beyond an updated soft stop limit will not be recalled as they are “out of range.”

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